diff --git a/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/component/objectdetails/AbstractObjectMainPanel.java b/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/component/objectdetails/AbstractObjectMainPanel.java
index f203607cd02..09e5ae9a1fe 100644
--- a/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/component/objectdetails/AbstractObjectMainPanel.java
+++ b/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/component/objectdetails/AbstractObjectMainPanel.java
@@ -108,6 +108,7 @@ public Form<PrismObjectWrapper<O>> getMainForm() {
 
     private void initLayout(PageAdminObjectDetails<O> parentPage) {
         mainForm = new Form<>(ID_MAIN_FORM, true);
+        mainForm.setMultiPart(true);
         add(mainForm);
         initLayoutTabs(parentPage);
         initLayoutOptions();
diff --git a/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/page/admin/workflow/WorkItemDetailsPanel.java b/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/page/admin/workflow/WorkItemDetailsPanel.java
index b1773e670cd..b1b0f794b37 100644
--- a/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/page/admin/workflow/WorkItemDetailsPanel.java
+++ b/gui/admin-gui/src/main/java/com/evolveum/midpoint/web/page/admin/workflow/WorkItemDetailsPanel.java
@@ -223,6 +223,7 @@ public boolean isVisible() {
         Form evidenceForm = new Form(ID_CASE_WORK_ITEM_EVIDENCE_FORM);
         evidenceForm.add(new VisibleBehaviour(() -> CaseTypeUtil.isManualProvisioningCase(parentCase) &&
                 (!SchemaConstants.CASE_STATE_CLOSED.equals(parentCase.getState()) || WorkItemTypeUtil.getEvidence(getModelObject()) != null)));
+        evidenceForm.setMultiPart(true);
         add(evidenceForm);
 
         UploadDownloadPanel evidencePanel = new UploadDownloadPanel(ID_CASE_WORK_ITEM_EVIDENCE, parentCase != null &&